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What is "core" versus "compatibility" styles of writing OpenGL applications?

There are nineteen different versions of OpenGL, all of which are now listed as "compatibility" except for three that are listed as "core"; those are dated 2/1/1997, 5/18/2002 and 8/11/2009
"Core" programmers are the ones who created OpenGL, while "compatibility" programmers are the ones hired by other companies to make older applications work on newer machines.
"Compatibility" and "Core" modes are the same mode, but one use gl* functions and the other uses cgl* functions
"Core" is the stuff that comes recommended in the specification for the version you are writing for, while "compatibility" uses deprecated functions or functions from other versions that are not backward compatible.
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